Power-hammer.



J. OBRIEN.

POWER HAMMER.

APPLIOATION FILED 001225, 1907.

904,21 6 Patented Nov. 17, 1908.

2 SHEETS-SHEET 1.

WITNESSES TH. NORRIS FITBRS co., wuumanm, D. c.

J. OBRIEN.

POWER HAMMER.

APPLIOATION rum) 00T.25,-1907.

Patented Nov.17,1908.

2 SHEETS-SHEET 2.

WITNE sszs I what are termed as power-hammers.

UNITED STAIEQNIYYIENT enrich.

JOSEPH OBRIEN, OF BROOKLYN, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, OF ONE- I-IALF TO JANE V. FARLEY, OF BROOKLYN, NEW YORK.

POW'ER-HAMIVEER.

Specification of Letters Patent.

Application filed October 25, 1907.

Patented Nov. 17, 1908.

Serial No. 399,218.

To all whom it may concern:

Be it known that I, JOSEPH OBiunx, a citizen of the United States, residing at No.

, 3%?) Bridge street, Brooklyn, New York, have invented new and useful Improvements in Power-Hammers, of which the following is a specification.

My invention relates to improvements in In this class or type of hammers as heretofore constructed, the ram or hammer proper and helve, have all been directly or indirectly connected together, although they have had separate or independent movement relatively in some instances. The ram and helve have also been resiliently connected and the helve alone has possessed the quality of resiliency.

In my invention the hammer or ram and helve or arm are wholly separate or independent of each other so far as concerning any connection between the same, direct or otherwise, the helve practically exerting the force of its stroke directly upon the ram, and which is found to be practically advantageous, over the forms of hammers above recited in the following particulars.

The hammer is adapted to deliver precisely the character of blow desirable as has been appreciable from actual use, and it has been found adapted for use upon work of varying thicknesses without requiring any adjustment of the parts for each separate thickness.

The invention consists of certain instrumentalities or means for carrying out the aforesaid ends, substantially as hereinafter fully disclosed and pointed out by the claim.

In the accompanying drawing illustrating the preferred embodiment of my invention: Figure 1 is a side elevation thereof. Fig. 2 is a vertical longitudinal section of the same. Fig. 3 is a vertical transverse section taken close to and viewing in the direction of the ram or hammer proper. Fig. at is a plan view of the device.

In practicing my invention I have adopted the general combination and arrangement of parts herein shown as the preferred form of disclosing its application wherein 1 is a suitable housing including its base, within and upon which the operative parts are all mounted.

The hammer or ram 2, of general rectangular outline is vertically slidable or movable as usual and equipped therefor in the usual way, and has a preferably removable face member 3, the latter being so adapted as shown or in any other well known man ner. Said ram or hammer has a vertical or longitudinal recess l in its surface presented next to and for receiving the helve or arm presently described; and arranged or hung within said recess at its upper end is a roll 5, and secured at one end in the lower end of said recess is a preferably [lat metal looped spring 6, with its other end adapted to extend into said recess and arranged a short distance from the lower end of said recess for a purpose presently made apparent. As will be seenthe recess t only opens on the inner face of the hammer whereby said recess is somewhat protected from dust and dirt.

A helve or arm 7, whose free or forward end enters the recess 4 of the hammer or ram 2, as above intimated, and engages the roll 5 and spring 6, as it makes its upward and downward strokes, respectively, has its opposite end fixed to a rock-shaft 8 suitably ]OUIDHlGCl in position. It will thus be noted that the arm or helvc has no connection with the hammer or ram, whatever both the helve and ram thus being capable of independent or separate movement without interference of one with the other in making their respective strokes; the helve or arm, however, practically exerting the force of its stroke directly upon, and for actuating the ram or hammer.

A spring or resilient member 5), of approximately U form or having an intermediate curved portion and longitudinal arms and preferably flat, the greater portion of its length, has its lower end portion secured or fixed to a cross piece of the housing 1 directly below and a short distance from the arm or helve 7 Said spring or resilient member has its curved portion or the bottom of the U, standing outwardly away from the rock shaft 8 bearing the arm or helve 7. The upper leg or member of the U is very slightly depressed or deflected out of a straight line and occupies a position just above said helve or arm and also out of contact therewith, said leg or member being preferably rounded or having rod-like outline at its forward end, and received by an upstanding eye-formation 10 upon a stirrup or clip 11 fitted upon and suitably clamped or keyed, as at 12 to said helve or arm. This contrivance may it is obvious, be slid or adjusted along said helve or arm toward the curve or bottom of the U of the spring and thus provide for additionally stressing the latter, or when the spring has become more or less weakened, its tension may be increased by such movement of said clip or stirrup. The action of the spring or resilient member 5), by reason of the aforesaid construction and arrangement of parts is to automatically impartan upward movement to the helve or arm 7 after the downward flexing of said spring by the corresponding stroke of the arm or helve, said spring acting as a counterbalance to overcome the weight of the ram and to keep said ram on the upstroke ready for use. It is also noted that the hammer or ram will be duly cushioned and have the requisite resiliency by the action of the spring 6 in the contact of the latter with the helve or arm 7, while the frictional roll 5 tends to reduce jar and friction as the hammer or ram is moved in the opposite direction and the helve or arm has contact with said roll, thus promoting efficiency of action of the hammer and facility of operation of the several parts.

An adjusting rod connection 13 is arranged between the arm or helve 7 and a crank or eccentric 14 upon the actuating fly wheel equipped shaft 15 as usual in this class of devices, said shaft also being provided with a weighted driving )ulley 16 suitably belted to the source of driving power all as now practiced. Said rod connection is constituted of separate sections relatively adjustable by a right and lefthand screw-threaded sleeve or nut 13 to render the length of the rod variable for controlling the stroke of the helve or arm and ram or hammer, as circumstances may require.

A belt tightener 17 is provided, comprising a rock shaft 18 suitably arranged or journaled to apply or bring a pulley-like roll or drum 19, carried by an arm 20 on said shaft, into contact with and cause it to press upon the driving belt by suitably actuating said rock shaft. A preferably baillike foot lever 21, which has the terminals of its lateral. members or arms pivoted to the base of the housing 1, is employed for actuating the belt-tightener rock shaft 18,

said members having link and crank arm connection 22 with said rock-shaft preferably upon both sides of said housing. In order to hold the belt tightener drum or roll 19 initially out of engagement with the driving belt a spring 23 is connected at one end to an arm 24, suitably applied to the rock shaft- 18, the opposite end of said spring being secured to a fixed point in any usual way, as by a hook-ended plate 25 fastened to a cross piece of the housing 1. Both of the arms 20, 24 are preferably sleeved upon the rock shaft 18 and have set or holding screws 20 24? inserted through their respective sleeves, for apparent reasons.

A suitable friction pad equipped brake shoe 26 is attached or applied to the rock shaft 18, at one end, for engagement with the fly wheel of the driven shaft 15 to provide for arresting the action of the hammer or machine this being operated or withdrawn through the foot lever 21, when required.

As alrealy noted, by means of the aforesaid combination and arrangement of parts the hammer or ram is adapted to deliver just exactly the character of blow desirable in hammering the metal as has been found from actual experience and for use upon work of varying thicknesses without requiring any adjustment of the parts for each separate thickness of the metal or material operated upon.

Latitude, it is understood, is allowed herein for making changes as to the various details of construction or arrangement of the parts without departing from the spirit of my invention.

I claim:

A power hammer comprising a hammer, an arm having one end engaging with the hammer and its other end pivoted, means for oscillating said arm, said means engaging with said arm intermediate its ends, a curved spring having one end rigidly supported and its other end bent over the rear end of the arm, and a stirrup adjustably engaging the arm and having a part engaging the free end of the spring.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH OBRIEN. Vitnesses W. P. BURKE, R. P. APPLETON. 

